DE102022130698A1 - Method and lighting device for illuminating wall surfaces - Google Patents

Abstract

The present invention relates to a lighting device for illuminating wall surfaces such as shelves or bookcases, with at least one spotlight which comprises a light source and a reflector for capturing and emitting the light emitted by the associated light source in the form of a beam, wherein the reflector has two reflector shells which are arranged on opposite sides with respect to the light source and are pivotably mounted relative to the light source and relative to one another about at least one tilt axis which extends transversely to the main radiation direction of the light source and parallel to a dividing plane between the reflector shells.

Description

The present invention relates to a method and a lighting device for illuminating wall surfaces such as shelves or bookcases, with at least one spotlight which comprises a light source and a reflector for capturing and emitting the light emitted by the associated light source in the form of a beam of rays.

To illuminate upright wall surfaces such as shelves with goods or books or walls in museums or exhibitions hung with pictures, spotlights can be used which use a reflector to direct the emitted light beam specifically onto the wall and, if necessary, onto the floor in order to illuminate corresponding sections of the wall. Spotlights which are mounted at the top of a wall adjacent to it, for example on the ceiling, and which illuminate the wall are sometimes referred to as wallwashers. Spotlights which generally shine downwards onto a floor surface are sometimes referred to as downlights, whereby such spotlights can be integrated into ceiling panels, mounted freely hanging or pendulum-like, or attached to power rails and combined in matrix-like spotlight arrangements. Depending on the application, however, a single spotlight can also be used, for example to illuminate a shop shelf, a shop display case or an individual object.

In particular, such spotlight arrangements can be used to illuminate long aisles such as shelves in supermarkets, but also as shop lighting, for example for lighting display cases or as shelf lighting, kitchen lighting, corridor lighting, staircase lighting or in conference rooms for blackboard or flipchart lighting. Alternatively or additionally, such spotlights can also illuminate shelves and the wall surfaces above them with, for example, advertising space, or illuminate self-illuminating refrigerated shelves in order to achieve greater brilliance on the products. Furthermore, such spotlight arrangements can also be built into electrical appliances such as refrigerators and ovens in order to illuminate the wall and/or floor surfaces of the appliances.

Linear lighting arrangements that extend along a longitudinal axis parallel to the aisle axis are usually used to illuminate long, narrow aisles. However, such linear lighting arrangements usually lack brilliance. The products on a shelf do not stand out individually and sparkle, but rather diffuse, contour-absorbing lighting is created.

If no elongated lamps such as fluorescent tubes are used, but point-shaped light sources such as LEDs are used, it makes sense not to use extruded profile-like, elongated reflectors, but to use reflector shells that are individually assigned to the light sources and are curved in multiple axes and can capture a larger part of the light emitted by such point-shaped light sources in order to achieve more efficient illumination.

In particular, each light source or each group of light sources, such as an LED cluster, can be assigned a shell-shaped or half-shell-shaped reflector that captures the light and projects it in the form of a beam of rays onto a specific area of the aisle and/or a shelf and/or aisle wall. Each light source forms a spotlight together with the reflector assigned to it, so that the linear lighting device is made up of one or more rows of such spotlights. However, with such spotlights with several individual reflectors, it is not easy to achieve uniform and glare-free illumination of narrow and narrow aisles, since the beam of rays from a single spotlight usually only illuminates part of such a aisle.

In the case of long aisles in the form of shelves in supermarkets, the situation is made more difficult by the fact that the aisle walls formed by the shelves are not smooth, bright surfaces that could be evenly illuminated even with strong, sweeping light at acute angles, but are unevenly shaped in the form of a constantly changing relief due to the goods standing on the shelves and often being rearranged, and are of varying brightness or, depending on the product label, dark. In addition, such shelves also have a certain depth, so that the lighting should, if possible, shine at least a little way into the shelves in order to also illuminate goods that are a little lower down the shelf.

A difficulty in illuminating such aisles or the shelves there arises from different ceiling heights or different mounting heights of the spotlights, as well as from different aisle widths and shelf heights, which make it difficult overall to project the beams emitted by the spotlights onto the shelves and floor surfaces in the desired way in order to achieve the desired lighting effects. This can be made more difficult by the fact that an aisle can vary in width over its length or can have wall projections, so that the shelves are not always the same distance from each other along the length of the aisle or, in the case of one-sided wall projections in the aisle, can be arranged asymmetrically to the middle of the aisle in sections, which can also be the case if the shelves are of different depths in different aisle sections. A similar effect occurs if the spotlights are mounted off-centre, which can be caused by ceiling projections or similar, so that it is difficult overall to illuminate the shelf walls in the desired way with similarly designed spotlights arranged in a row.

At the same time, not only should the goods on the shelves themselves be brilliantly illuminated, but visitors and customers should also be provided with as little glare as possible, but still bright illumination in the aisle between the aisle walls and in particular on the aisle floor and in the "shopping cart". This implies contradictory requirements for the height of the lighting above the floor, which cannot both be met at the same time. While a low arrangement of the lighting would be advantageous for illuminating the depth of the shelves, glare-free lighting for customers walking in the aisles is easier to achieve with a higher arrangement of the lighting.

A linearly extending lighting device with an elongated housing is known, for example, from the document EN 10 2005 007 347 A1 or the DE 20 2014 103 431 U1 known, whereby this previously known lighting device has several rotatably mounted lighting units in order to adjust the beam angle and thus be able to better meet different local conditions. However, the adjustable lighting modules are cumbersome overall and require quite solid bearings to ensure adjustability.

Furthermore, the EP 3 369 988 A1 A shelf spotlight is known whose light source shines away from the shelf wall to be illuminated and therefore in the wrong direction, with a shell-shaped reflector bowl facing the light source, which captures part of the light coming from the light source and throws it onto the shelf wall, and lets the rest of the light pass unreflected onto the floor. In order to be able to illuminate the shelf walls on both sides of an aisle, two such reflector bowls are placed back to back between two light sources mounted on the outside. The spotlight is adapted to the installation situation and the shelf wall geometry in such a way that the boundary between unreflected direct light and reflected indirect light lies in the edge between the floor and the shelf wall, so that there are no light-dark lines. However, this previously known shelf spotlight reacts sensitively to off-center offsets during installation and varying ceiling heights.

Based on this, the present invention is based on the object of creating an improved lighting device and an improved method for illuminating wall surfaces such as product shelf walls of the type mentioned, which avoid the disadvantages of the prior art and develop the latter in an advantageous manner. In particular, the aim is to achieve as uniform an illumination as possible over the length of the aisle, both the floor and the adjacent shelf wall, with high lighting efficiency and at the same time freedom from glare, which is insensitive to different installation situations with different ceiling heights and aisle widths.

According to the invention, the above object is achieved by a lighting device according to claim 1 and a method according to claim 20. Preferred embodiments of the invention are the subject of the dependent claims.

It is therefore proposed to split the reflector associated with the light source into two reflector shells that can be adjusted relative to the light source and also relative to each other in order to be able to align the reflected indirect light beam in the desired manner and to match it to the geometry of the installation environment without having to mount the entire luminaire module or the light source in a movable manner, which can nevertheless be the case. The lighting device including the light source and its supply means such as an LED board and an associated cooling module can, regardless of the specific ceiling height, also be permanently mounted with a slightly off-center offset if necessary, whereby the desired alignment of the indirect light beam and the direct light beam can then be individually adjusted by tilting the reflector shells.

According to the invention, the reflector of the radiator has two reflector shells which are arranged on opposite sides with respect to the light source and are pivotably mounted relative to the light source and relative to each other about at least one tilt axis which extends transversely to the main radiation direction of the light source and parallel to a separation plane between the reflector shells.

In particular, the reflector shells can be spread out more or less by tilting them, so that the reflector as a whole expands more or less rigidly away from the light source.

In an advantageous development of the invention, the two reflector shells can be tilted independently of one another, so that, for example, only one reflector shell is tilted and the other reflector shell remains stationary, or both reflector shells are tilted, but by different tilt angles and/or in the same or different directions. By being able to tilt them independently of one another, the reflected indirect light beams and, if applicable, the direct light beams let past the reflector shells can be adjusted independently of one another, for example to compensate for an off-center transverse offset of the spotlight during installation or to adapt the beams to different heights of shelving walls to the right and left of the aisle.

The reflector shells can be mounted so as to be pivotable about a common tilt axis or about two at least approximately coaxial tilt axes. In an alternative development of the invention, the reflector shells can also have their own tilt axes, which can then advantageously be arranged parallel to one another and spaced apart from one another.

Advantageously, the at least one tilt axis extends in the area of the front edges of the reflector shells, which are arranged closer to the light source than the opposite front edges of the reflector shells or face the light source. In particular, the at least one tilt axis can be arranged approximately in the area of the light source or in its immediate vicinity, wherein the tilt axis can be arranged parallel to the ceiling and parallel to a dividing plane between the reflector shells approximately at the height of the light source when the spotlight is mounted on the ceiling.

The said at least one tilting axis can in particular be arranged in such a way that the reflector shells with their edge regions projecting from the light source can be pivoted open and closed or moved away from and towards each other, in particular similar to two flower petals that open when light hits them and move towards each other and close again in the dark.

The said separation plane between the reflector shells can contain the main beam axis of the at least one light source or can be aligned parallel to it and can extend approximately centrally between these reflector shells if the tilt angles of the reflector shells are the same. When the spotlight is mounted on the ceiling, the said separation plane can extend vertically through the light source and be aligned parallel to the at least one tilt axis.

The reflector shells mentioned can have bulbous, concavely curved reflection surfaces that capture the light emitted by the light source or a portion of it and project it onto the wall surface or shelf section to be illuminated. One or each reflector shell can have an overall bulbous or single-shell curved or simply shell-shaped reflection surface that emits a reflected indirect light beam, whereby the bulbousness of the reflecting reflector surface can be concave. As an alternative to such a simply curved shell, the reflector shell can also have one or more ridge-like constrictions in the area of its reflection surface that protrude towards the light source or the dividing plane between the reflector shells and divide the preferably still bulbous reflection surface into two or more partial shells, so that the reflector shell as a whole has a double pear-shaped or multi-cheek contour or is divided into several partial shells. The preferably bulbous partial shells each throw a reflected indirect light partial beam into the target area, in particular onto the shelf wall mentioned, whereby the multiple indirect light partial beams emitted by the partial shells can overlap at least partially or completely in the target area, in particular onto the shelf wall, in order to irradiate a wall or shelf area multiple times. This makes it possible to achieve an overall uniform illumination.

The ridge-like constriction mentioned can extend in a plane perpendicular to the dividing plane between the reflector shells and essentially parallel to the main beam direction of the light source. If one considers a ceiling mounting or pendulum suspension of the spotlight in a corridor, the constriction mentioned can extend in an upright plane perpendicular to the longitudinal direction of the corridor. If a reflector shell has several such ridge-like constrictions, these constrictions can extend in planes that are parallel to one another or slightly intersected with one another and can be aligned parallel to the main beam axis of the light source.

In an advantageous development of the invention, the reflector shells with their bulbous reflection surfaces can face each other and/or face the wall surface to be illuminated, wherein the light source can be arranged between the two reflector shells, so that part of the light emitted by the light source is emitted by one reflector shell and part of the light is emitted to the opposite side the light source is captured by the opposite reflector bowl.

When the spotlight is viewed in a direction approximately parallel to the dividing plane between the reflector shells, the reflector design can be such that a right reflector shell illuminates a left wall surface and a left reflector shell illuminates a right wall surface, each with a reflected indirect light beam. The left and right wall surfaces mentioned are to the left and right of the light or the left and right wall surfaces are, for example - in the direction of view mentioned - the left and right walls of a corridor.

Alternatively or in addition to the specific contouring of the reflector shells, the spotlight in a further development of the invention is characterized in that each reflector shell is irradiated by a common light source and captures light that comes from a common light source. In this respect, it is sufficient to provide only one light source for irradiating opposite wall surfaces, which can be designed, for example, as a point light source or as a half-space spotlight, for example in the form of an LED or a COB module (chip on board LEDs), but a matrix-like arrangement of several light sources, for example in the form of an LED cluster, can also be provided and assigned to the two reflector shells together. Even when using several light sources, for example in the form of an LED cluster, the aforementioned several light sources can irradiate both reflector beam shells, i.e. the reflector shells can capture light coming from a common light source cluster, with one reflector shell throwing the captured light onto a right-hand wall surface and the other reflector shell throwing the captured light onto the left-hand wall surface.

Such a common light source for both reflector shells or for all reflector shells can be achieved, for example, by arranging the common light source in the separation plane between the two reflector shells or generally between the two reflector shells.

In an advantageous development of the invention, the light source can be aligned such that the main radiation axis of the light source passes centrally, approximately centrally through the reflector, which is formed by both reflector shells together, and/or extends parallel to the said separation plane and extends transversely to the tilt axis of the reflector shells.

In particular, the light source can be aligned with its main radiation direction at least approximately vertically downwards if the spotlight is mounted on the ceiling or parallel to the ceiling.

The light source can be a half-space spotlight which, when mounted on the ceiling, illuminates the entire half-space under the ceiling or the mounting plane parallel to the ceiling, whereby parts of the light are captured by the opposite reflector shells in the manner mentioned and an unreflected direct light component emitted centrally by the light source, which passes the reflector shells, can fall down onto the floor and possibly also onto the shelves or the side aisle walls.

With such an alignment of the light source with its main radiation direction centrally out of the reflector, which is formed jointly by the two reflector shells, the lamp or the reflector can be easily covered and/or closed by means of a transparent cover, for example in the form of a cover glass or a cover plate, without complex contouring of the cover being necessary or distortions of the beams occurring. In particular, a flat cover plate can close the reflector and/or a spotlight housing in which the reflector and light source are arranged, and form the light exit surface of the spotlight.

By means of such a flat cover plate or even at the height of such a fictitious flat cover plate, it is also easily possible to mount the luminaire or spotlight recessed into the ceiling and to close the ceiling hole flush with a cover plate or a cover plate in the ceiling plane.

Such a cover of the spotlight, which forms its light exit surface and can be designed in particular in the form of a flat cover plate, can advantageously comprise an opaque, for example black-colored edge area, for example in the form of an outer, opaque ring area, within which the cover is transparent in order to limit the direct light component that is allowed to pass unreflected by the reflector shells to a certain area. Without such an opaque edge area of a cover, the beam angle of the direct light would also change when the reflector shells are adjusted or tilted, since the tear-off edge of the reflector determines the widening angle of the direct light component.

Advantageously, even when the reflector shells are swivelled towards each other, a significant A large proportion of the light source is emitted unreflected as direct light from the reflector, for example to illuminate the floor when the spotlight is mounted parallel to the ceiling. Such a high proportion of direct light, which is emitted unreflected, can achieve a high level of lighting efficiency, as losses in the reflector are avoided. For example, even when the reflector shells are in the closest possible position, a proportion of more than 30% or more than 40% of the luminous flux emitted by the light source can be emitted unreflected past the reflector shells.

The reflector shells can advantageously be configured to project the reflected beam of light essentially exclusively onto the shelf walls or the wall surfaces to be illuminated. The reflector shells can therefore be placed in a tilted position and designed to emit a beam of light directed diagonally downwards when the spotlight is mounted at the height of an upper edge of the wall surface to be illuminated or higher, which beam expands from the reflector shell and extends in the target plane, i.e. the wall surface to be illuminated, from its lower edge to its upper edge. If the wall surface to be illuminated is a shelf, the reflected indirect light beam can illuminate the shelf from its lower edge to its upper edge, although the upper edge of the beam can also be above the shelf in the target plane, for example to illuminate a wall surface above the shelf or an advertisement attached there.

The unreflected direct light beam that is emitted by the light source past the reflector shells can illuminate the floor between opposite wall surfaces and, depending on the tilt position of the reflector shells and/or the opaque edge area of a spotlight cover, can end in the transition area to the wall surface and/or possibly also lie a little way up above the said transition area. In a shelf of goods that does not form a smooth wall surface due to various goods, but rather forms a relief that goes into the depth, the transition area between direct light and indirect light is not particularly noticeable.

In a further development of the invention, the reflector can be designed to provide longitudinal blanking in order to avoid people in the corridor in which the spotlight is mounted being blinded when they naturally look diagonally upwards and look along the corridor. In particular, the reflector shells can be designed to limit the beam leaving the reflector in the longitudinal direction of the corridor, more precisely in areas in which the beam falls approximately in the longitudinal direction of the corridor or is approximately parallel to a vertical longitudinal plane of the corridor, to an angular range of a maximum of 2x 50° or 2x 45° or 2x 40° or 2x 35°, wherein the said angular range is preferably measured in the middle of the vertical. In relation to the spotlight itself, the said longitudinal blanking takes place essentially in the dividing plane between the reflector shells or in components of the beam that depart at an acute angle to this. In order to irradiate the shelving walls on opposite sides of an aisle, the radiator is advantageously mounted in such a way that the said dividing plane is arranged approximately parallel to the longitudinal axis of the aisle and upright, so that when the beam areas approximately parallel to the dividing plane and in the adjacent area are blocked out, people walking in the aisle are not blinded.

In order to maintain the longitudinal masking mentioned for different swivel positions of the reflector shells or - independently of this - to effectively generate the reflected indirect light beam, at least one reflector shell can have a wing-like overlap flange on a lateral edge section, which slides over the edge of the adjacent reflector shell when the reflector shells are swiveled together. Such a side wing or wing-like overlap flange can ensure that no V-shaped gap is created between the lateral edge sections of the reflector shells when the reflector shells are swiveled apart. When swiveled apart, the edge wing that previously overlapped or was pushed behind the adjacent edge section becomes visible from the light source, i.e. the wing-like overlap flange is no longer hidden behind the adjacent side edge of the other reflector shell or there is no longer any overlap, but the inner surface of the overlap flange becomes visible when viewed from the light source, so that direct light is not unintentionally emitted through a V-shaped gap between the reflector beams.

Advantageously, the said wing-like overlap flange can be designed to be reflective on the inner surface side in order to become light-technically active in the position of the reflector shells pivoted further apart and to capture and reflect part of the light coming from the light source, in particular onto the shelf wall or wall surface opposite the reflector shell.

Depending on the application or installation environment, it is also possible to use the spotlight with only one reflector shell in order to only Such a one-sided spotlight can be advantageous, for example, to illuminate a shelf wall that has no other shelf wall opposite it or that is free to face an open space at the front, so that the spotlight only emits indirect light reflected on one side.

In an advantageous development of the invention, the spotlight can have flush-mounted mounting means, with the aid of which the spotlight can be mounted essentially flush with the ceiling in a ceiling cutout. The spotlight, in particular its reflector, is advantageously designed in such a way that the ceiling cutout essentially only has to have the diameter of the reflector or does not have to be significantly larger than the light exit surface or the luminous size of the spotlight, even if the spotlight is installed flush with the ceiling. It is sufficient if the ceiling cutout has essentially the same diameter or the same contour area as the light exit surface of the spotlight in the light exit cross section of the reflector.

In an advantageous development of the invention, a light source can be used that is designed to be variable in its color temperature or in its radiation spectrum. For example, a so-called tunable white light source can be used. Alternatively or additionally, LED clusters of different colors can also be provided, which can shine in different colors overall by variably controlling the individual LED elements.

The light source can advantageously have a primary optic, for example in the form of a lens, which can be provided directly on the LED module or between the light source and the reflector, in order to mix the light emitted by the light source. Such a primary optic for mixing the light from the light source can make the radiation more uniform before the light then falls on the reflector shells.

Alternatively or additionally, the reflector can also be faceted to further mix the light.

• 1: eine schematische Darstellung einer Beleuchtungsvorrichtung nach einer vorteilhaften Ausführung der Erfindung, die in ihrer Einbausituation über eine Wand zwischen zwei Regalwänden in einer Seitenansicht gemäß einer Blickrichtung in Längsrichtung des Gangs dargestellt ist, wobei bei der Ausführungsvariante gemäß Teilansicht (a) das von einer Reflektorschale reflektierte Indirektlicht-Strahlenbündel nur auf eines der Regale fällt und das an den Reflektorschalen vorbeigehende, unreflektierte Direktlicht-Strahlenbündel zum Ausleuchten des Bodens dargestellt ist, und wobei gemäß Teilansicht (b) das von einer Reflektorschale reflektierte Indirektlicht-Strahlenbündel wiederum nur auf eines der Regale fällt und das unreflektierte Direktlicht-Strahlenbündel sowohl auf den Boden als auch auf das Regal fällt,
• 2: eine perspektivische Draufsicht auf den Strahler der Beleuchtungsvorrichtung aus 1, die dessen Abdeckglas und die darunterliegend angeordneten, davon abgedeckten Reflektorschalen und die zugehörige Lichtquelle zeigt,
• 3: eine perspektivische Explosionsdarstellung der beiden Reflektorschalen des Reflektors, die deren Schlitzabdeckung zeigt und die Lage der Kippachse verdeutlicht,
• 4: eine ausschnittsweise, perspektivische Ansicht des Reflektors des Strahlers bei geschlossenen Reflektorschalen, die den Lichtaustrittsquerschnitt des Reflektors und den umgebenden Reflektorkragen zeigt,
• 5: eine Seitenansicht des Reflektors in verschiedenen Kippstellungen und die in Abhängigkeit der Kippstellungen erzeugte Indirektlicht-Strahlenbündel, die von den Reflektorschalen auf die Regalwände bzw. Wandabschnitte geworfen werden, wobei der Zusammenhang der zunehmend höheren Montageposition und der daran angepasste, zunehmende Verkippwinkel der Schalen dargestellt ist,
• 6: eine Schnittansicht des Strahlers in einer Schnittebene C-C (vgl. 1 b), die sich vertikal und parallel zur Längsrichtung des Gangs erstreckt, wobei die vom Reflektor bewirkte Längsausblendung und das auf einen relativ steilen Winkelbereich beschränkte Strahlenbündel in der Ganglängsebene dargestellt ist, und
• 7: eine perspektivische Darstellung einer Reflektorschale mit einer gratartigen Einschnürung in Vorder- und Rückansicht, die der Reflektorschale eine insgesamt doppelbirnige Konturierung gibt und die Reflektorschale in zwei Teilschalen unterteilt, wobei die Teilansicht (a) die konvex gekrümmte, reflektierende Innenmantelseite der Reflektorschale und die Teilansicht (b) die Außenmantelfläche der Reflektorschale zeigt.

The invention is explained in more detail below using a preferred embodiment and associated drawings. In the drawings:

• 1 : a schematic representation of a lighting device according to an advantageous embodiment of the invention, which is shown in its installation situation over a wall between two shelf walls in a side view according to a viewing direction in the longitudinal direction of the aisle, wherein in the embodiment variant according to partial view (a) the indirect light beam reflected by a reflector shell only falls on one of the shelves and the unreflected direct light beam passing by the reflector shells is shown for illuminating the floor, and wherein according to partial view (b) the indirect light beam reflected by a reflector shell again only falls on one of the shelves and the unreflected direct light beam falls on both the floor and the shelf,
• 2 : a perspective top view of the spotlight of the lighting device from 1 , which shows its cover glass and the reflector shells arranged underneath and covered by it and the associated light source,
• 3 : a perspective exploded view of the two reflector shells of the reflector, showing their slot cover and the position of the tilt axis,
• 4 : a partial, perspective view of the reflector of the spotlight with the reflector shells closed, showing the light exit cross-section of the reflector and the surrounding reflector collar,
• 5 : a side view of the reflector in various tilt positions and the indirect light beams generated depending on the tilt positions, which are thrown by the reflector shells onto the shelf walls or wall sections, showing the connection between the increasingly higher mounting position and the corresponding, increasing tilt angle of the shells,
• 6 : a sectional view of the radiator in a cutting plane CC (cf. 1 b) which extends vertically and parallel to the longitudinal direction of the corridor, showing the longitudinal suppression caused by the reflector and the beam limited to a relatively steep angular range in the longitudinal plane of the corridor, and
• 7 : a perspective view of a reflector shell with a ridge-like constriction in front and rear view, which gives the reflector shell an overall double-bulb contour and divides the reflector shell into two partial shells, wherein the partial view (a) shows the convexly curved, reflective inner shell side of the reflector shell and the partial view (b) shows the outer shell surface of the reflector shell.

The lighting device 1 can comprise several spotlights 2, of which 1 only one is shown, wherein the said spotlights 2 can, for example, be distributed along a corridor in its longitudinal direction, for example evenly distributed along a straight line or an arcuate curve. The spotlights 2 can, for example, be mounted on the ceiling 4 above the corridor 3 or a little way below the ceiling 4 in order to illuminate the floor 5 of the corridor 3 or the floor beneath the spotlights 2 as well as wall surfaces bordering the corridor 3 on the sides, for example in the form of shelving units 6, 7. In principle, however, it would also be possible to mount the spotlights 2 on the ceiling in front of just one wall or a little way below it in order to illuminate just one wall surface.

How 1 shows, the spotlight 2 comprises a reflector 8 which, viewed as a whole - roughly speaking - can be contoured like a pot or a tub, wherein a light source 9 can be arranged at the bottom of the reflector 8.

The reflector 8 is divided into two reflector shells 10, 11, which can each form multi-axis curved shell segments. In particular, the reflector shells 10, 11 can each have a bulbous, convexly curved, photometrically active reflection surface in order to capture light coming from the common light source 9 and project it onto one of the side shelf walls 6, 7 or wall sections.

How 7 shows, the reflector shells 10, 11 can also have one or more ridge-like constrictions 24 in the area of their reflection surface, which protrude towards the light source 9 or the dividing plane 17 between the reflector shells 10, 11. The overall still bulbous reflection surface is divided by the constriction 24 into two or more partial shells 25, 26, so that the reflector shell 10, 11 has a double pear-shaped or multi-cheek contour. The bulbous partial shells 25, 26 each throw a reflected indirect light partial beam into the target area, in particular onto the shelf wall 6, 7 mentioned, wherein the multiple indirect light partial beams emitted by the partial shells 25, 26 can overlap at least partially or completely in the target area, in particular onto the shelf wall 6, 7, in order to irradiate a wall or shelf area multiple times. This allows an overall uniform illumination to be achieved.

The ridge-like constriction 24 mentioned can extend in a plane transverse to the dividing plane 17 between the reflector shells 10, 11 and essentially parallel to the main radiation direction 22 of the light source 9. If one considers a ceiling mounting or pendulum suspension of the spotlight 2 in a corridor 3, the constriction 24 mentioned can extend in an upright plane transverse to the longitudinal direction of the corridor.

If a reflector shell 10, 11 has several such ridge-like constrictions, these constrictions 24 can extend in planes that are parallel to one another or slightly intersected with one another and can be aligned parallel to the main radiation axis 22 of the light source 9.

As the 1 - 3 As can be seen from the drawings, the reflector shells 10, 11 are arranged with their convex-bulging reflection surfaces facing each other, with the light source 9 being arranged between the two reflector shells 10, 11 in the base area of the reflector 8 or in the area of a plane that sits on a front end area of the reflector shells 10, 11. The light source 9 sitting between the reflector shells 10, 11 thus simultaneously irradiates both reflector shells 10, 11, whereby light from the same light source 9 is reflected on the one hand onto a left wall surface and on the other hand onto a right wall surface.

The light source 9 is designed and arranged in such a way that a substantial part of the light emitted by the light source 9 is emitted past the reflector shells 10, 11 and thus unreflected. For example, more than 20% or more than 30% or even more than 40% of the luminous flux emitted by the light source 9 can be emitted past the reflector shells 10, 11 as an unreflected direct light beam 12. The said indirect light beam 12 can in particular illuminate the floor 4 of the aisle 3 between the shelf walls 6, 7, wherein the direct light beam 12 can be limited to the floor surface, for example can extend to the lateral transition edges to the shelf walls, see partial view a) of the 1 . If necessary, the direct light beam 12 can also extend beyond the floor 4 to irradiate a lower section of one or both shelf walls 6, 7 or even reach all the way up to the upper edge of the shelf wall, see partial view b) of the 1 .

On the other hand, the indirect light beams 13a and 13b reflected by the two reflector shells 10, 11 are advantageously limited to the lateral wall surfaces and do not fall onto the floor 5.

How 1 shows, the reflector shells 10, 11 can be configured such that the indirect light beam 13a in the target plane, i.e. on the respective side wall surface, for example in the form of one of the shelf walls 6, 7, from the lower edge to the upper edge of the desired wall surface, e.g. the shelf wall 6, and illuminates the wall surface or shelf wall 6 from bottom to top over the entire height.

Alternatively, it would also be possible for the indirect light beam 13a to extend beyond the shelf wall 6, for example on the upper side, and to illuminate a piece of wall surface underneath, for example in order to illuminate an advertisement attached there.

In order to be able to adapt the illumination of the side wall surfaces by the reflected indirect light beams 13a, 13b to different conditions and, if necessary, to compensate for a lateral offset of the spotlight 2 during installation, the two reflector shells 10, 11 are mounted so that they can be tilted relative to the light source 9 and relative to each other and can be fixed or adjusted in different angular positions. The tiltable mounting of the reflector shells 10, 11 is advantageously designed such that the reflector shells 10, 11 can be adjusted independently of each other and thus individually in different tilt positions.

The reflector shells 10, 11 can be pivotably mounted about a common or separate tilting axes 14, for example on a light source carrier 15 or a spotlight housing 16. The said at least one tilting axis 14 can extend transversely to the main radiation direction of the light source 9 and/or transversely to a main axis of the reflector 8 and/or parallel to the dividing plane 17 between the two reflector shells 10, 11. If one considers the spotlight 2 mounted on the ceiling, as is the case 1 shows, the said tilt axis 14 can extend parallel to the ceiling and parallel to the said dividing plane 17 and/or parallel to the longitudinal axis of the corridor 3 and/or approximately horizontally parallel to the wall to be illuminated.

The tilting axis 14 can advantageously be arranged in the bottom area of the reflector 8 or approximately at the level of the light source 9, so that the reflector 8 with its front edge area facing away from the light source 9 can be more or less spread out or swiveled together, as is the case 5 clarified.

By pivoting or tilting the reflector shells 10, 11, the indirect light beams 13a, 13b can be projected precisely onto the respective wall surface or the respective shelf wall 6, 7, even if the spotlight 2 is mounted at different heights or is arranged offset transversely to the longitudinal center axis of the aisle 3. How 5 As illustrated in the drawing, the two reflector shells 10, 11 can, for example, be spread further apart or positioned more strongly relative to the vertical if the spotlight 2 is mounted higher and higher in order to nevertheless illuminate the respective shelf wall 6, 7 with the indirect light beam 13a or 13b over the entire height. In particular, the reflector shells 10, 11 can be pivoted apart continuously or in several stages around the tilt axis 14 from a fully pivoted-together position in which the reflector shells 10, 11 define a substantially circumferentially closed reflector 8 or reflector ring, so that an increasing angle of spread between the reflector shells 10, 11 results, as a comparison of the positions of the reflector shells in 5 viewed from left to right.

In the pivoted-together position, the reflector shells 10, 11 can, for example, be flush with one another with their lateral longitudinal edges or extend with the said lateral longitudinal edges parallel to the dividing plane 17 or lie in the dividing plane 17. If one or both reflector shells are pivoted open, a V-shaped gap can result between the lateral edges of the reflector shells 10, 11, as is the case 5 shows.

Alternatively, the reflector shells 10, 11 can also be designed to overlap one another, whereby, for example, each reflector shell 10, 11 can have an overlapping flange 18 on one of its lateral edges or, if appropriate, one of the two reflector shells can have an overlapping flange 18 on both edges, which slides increasingly further over the other reflector shell when the reflector shells 10, 11 are pivoted together, so that the reflector shells 10, 11 can overlap in the region of the separation plane.

The mentioned overlap flange 18, cf. 3 , can also be designed as a reflector surface on the inside, so that the two reflector shells 10, 11 can together form a circumferentially closed reflector surface or a circumferentially closed reflector 8 even when the tilt positions are pivoted further apart.

As the 2 and 4 As can be seen from the drawings, the two reflector shells 10, 11 can have a substantially flat reflector edge on their front side facing away from the light source 9, at least when a position of the reflector shells pivoted together is considered. In particular, each of the reflector shells 10, 11 can comprise a flat, arcuately curved edge section on the front side facing away from the light source 9.

If necessary, an edge section of the reflector shells 10, 11 on the front side facing away from the light source 9 can be designed to be photometrically passive or can have a photometrically passive edge section 23, cf. 4 .

The design of the reflector shells 10, 11 and their tiltable mounting make it possible to install the spotlight 2 flush with the ceiling, for example, and/or to close or cover it with a flat cover 20, for example in the form of a flat cover plate. The cover 20 mentioned can, for example, form a housing cover for closing the spotlight housing 16 or form a cover cap or plate that can close a ceiling opening in which the spotlight 2 can be recessed.

How 2 shows, the said cover 20 can comprise a transparent central region which can be enclosed by an opaque edge region 21, in particular an annular, outer dimming region which can limit the emission of the direct light when the reflector shells 10, 11 are spread apart.

Advantageously, the reflector 8 provides longitudinal fading in order to avoid people in the aisle 3 being dazzled when they naturally turn their gaze diagonally upwards towards the spotlight 1 and look along the aisle 3. In particular, the reflector shells 10, 11 can fading out the beam leaving the reflector in the longitudinal direction of the aisle in flatter beam areas, more precisely in areas in which the beam falls approximately in the longitudinal direction of the aisle 3 or is approximately parallel to a vertical longitudinal plane of the aisle, to limit it to an angular range φ of a maximum of 2 × 50° or 2 × 45° or 2 × 40° or 2 × 35°, cf. 6 , wherein the said angular range φ can preferably be located centrally to the vertical.

With reference to the radiator 1 itself, the longitudinal blanking mentioned takes place essentially in the dividing plane 17 between the reflector shells 10, 11 or in the case of components of the beam that extend at an acute angle thereto. In order to irradiate the shelf walls 6, 7 on opposite sides of an aisle 3, the radiator 1 is advantageously mounted in such a way that the dividing plane mentioned is arranged approximately parallel to the longitudinal axis of the aisle 3 and upright, cf. 1 Partial view a), so that when the beam areas approximately parallel to the dividing plane 17 and in the adjacent area are blanked out, persons walking in the corridor are not blinded.

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• DE 102005007347 A1 [0010]
• DE 202014103431 U1 [0010]
• EP 3369988 A1 [0011]

Claims (20)

Lighting device for illuminating wall surfaces such as goods or bookshelf walls (6, 7), with at least one spotlight (2) which comprises a light source (9) and a reflector (8) for capturing and emitting the light emitted by the associated light source (9) in the form of a beam (12, 13), characterized in that the reflector (8) has two reflector shells (10, 11) which are arranged on opposite sides with respect to the light source (9) and are pivotably mounted relative to the light source (9) and relative to one another about at least one tilt axis (14) which extends transversely to the main radiation direction (22) of the light source (9) and parallel to a dividing plane (17) between the reflector shells (10, 11). Lighting device according to the preceding claim, wherein the reflector shells face each other with their convex, bulbous reflection surfaces and the light source (9) is arranged between the reflector shells (10, 11) such that light emitted by the light source (9) falls on both reflector shells (10, 11) and is reflected by the two reflector shells (10, 11) in the form of two reflected indirect light beams (13a, 13b) onto opposite wall surfaces, in particular is reflected substantially completely onto said opposite wall surfaces. Lighting device according to one of the preceding claims, wherein the reflector shells (10, 11) define between them a light exit opening (23) through which light emitted by the light source (9) exits past the reflector shells (10, 11) as an unreflected direct light beam (12). Lighting device according to the preceding claim, wherein the light source (9) is arranged relative to the reflector shells (10, 11) such that a main emission axis (22) of the light source (9) extends through said light exit opening (23) between the reflector shells (10, 11) and/or the light exit opening (23) is dimensioned such that more than 20% or more than 30% or more than 40% of the luminous flux emitted by the light source (9) is emitted as an unreflected direct light beam (12) past the reflector shells (10, 11), preferably even when the reflector shells (10, 11) are as close together as possible or pivoted towards one another. Lighting device according to one of the preceding claims, wherein the light source (9) is arranged with its main emission axis (22) parallel, in particular coaxially to a central axis through the reflector (8) and/or is arranged parallel to the separation plane (17) between the reflector shells (10, 11) transversely to the tilt axis (14) of the reflector shells (10, 11). Lighting device according to the preceding claim, wherein the light source (9) points with its main radiation direction at least approximately vertically downwards when mounted on the ceiling or pendant. Lighting device according to one of the preceding claims, wherein the at least one tilt axis (14) of the reflector shells (10, 11) is arranged in the region of a front wall region of the reflector shells (10, 11) facing the light source (9), in particular in the region of a plane passing through the light source (9) perpendicular to its main radiation direction. Lighting device according to one of the preceding claims, wherein the reflector shells (10, 11) can be spread apart and pivoted towards one another by pivoting about the at least one tilting axis (14) with their edge sections on the light exit side. Lighting device according to one of the preceding claims, wherein the reflector shells (10, 11) together with their front, preferably passive edge sections facing away from the light source (9) define an approximately flat contour. Lighting device according to one of the preceding claims, wherein the spotlight (2) has a transparent cover (20) which covers the reflector (8) towards the light exit side and/or closes a spotlight housing. Lighting device according to the preceding claim, wherein the cover (20) is designed as a flat cover plate. Lighting device according to one of the two preceding claims, wherein the cover (20) comprises a transparent central portion and an opaque anti-glare ring surrounding this central portion. Lighting device according to one of the preceding claims, wherein the reflector shells (10, 11) are configured to limit the reflected indirect light beam (13a, 13b) substantially completely to the wall surface to be illuminated and to keep it away from an adjacent floor section. Lighting device according to one of the preceding claims, wherein the reflector shells (10, 11) are configured to allow an unreflected direct light beam (12) passing by the reflector shells (10, 11) to fall at least partially onto the floor (4) between two opposite wall surfaces to be illuminated. Lighting device according to one of the preceding claims, wherein at least one of the reflector shells (10, 11) has at least one overlap flange (18) in a lateral edge section in the region of the dividing plane (17) between the reflector shells (10, 11), which overlaps over an adjacent lateral edge section of the other reflector shell when the reflector shells (10, 11) are pivoted together, wherein said overlap flange (18) is preferably provided with a light-reflecting surface on its inner shell side facing the light source (9), which is photometrically active in a position that no longer overlaps when the reflector shells (10, 11) are pivoted apart and reflects light captured from the light source (9) as indirect light. Lighting device according to one of the preceding claims, wherein at least one of the reflector shells (10, 11) is provided with a constriction (24) which projects like a ridge towards the light source (9) and/or the separation plane (17) and divides the light-reflecting surface of the reflector shell (10, 11) into at least two partial shells which project reflected indirect light partial beams onto the wall surface to be illuminated, wherein said indirect light partial beams at least partially overlap on the wall surface to be illuminated, preferably substantially completely overlap. Lighting device according to the preceding claim, wherein the ridge-like constriction (24) is formed in a plane transverse to the separation plane (17) and at least approximately parallel to the main radiation direction of the light source (9). Lighting device according to one of the preceding claims, wherein the reflector shells (10, 11) are designed to limit the beam leaving the reflector (8) to an angular range of a maximum of 2x 50° or 2x 45° or 2x 40° or 2x 35° in a longitudinal plane extending between the reflector shells and containing the main emission axis of the light source (9) and/or in the separation plane (17), wherein said angular range is preferably arranged approximately centrally or symmetrically to the main emission axis of the light source (9). Lighting device according to one of the preceding claims, wherein the reflector shells (10, 11) are designed to restrict the light exit side of the spotlight (2) to a beam cross-section which, when the spotlight (2) is mounted flush with the ceiling, enables the beam to emerge from a ceiling cutout which essentially corresponds to the cross-sectional area of the spotlight (2) and/or the light exit area of the spotlight (2). Method for illuminating two wall surfaces such as goods or bookshelf walls (6, 7) by means of at least one spotlight (2) which comprises a light source (9) and a reflector (8) with two reflector shells (10, 11), characterized in that the light source (9) throws light onto both reflector shells (10, 11), from which the received light is thrown onto the wall surfaces (6, 7) by reflection, in particular single reflection, in the form of two indirect light beams (13a, 13b), and the light source (9) throws light past the two reflector shells (10, 11) in the form of an unreflected direct light beam (12) onto the floor between the wall surfaces (6, 7), whereby by pivoting the two reflector shells (10, 11) relative to the light source (9) and relative to one another about at least one tilt axis (14) which extends transversely to the main radiation direction (22) of the light source (9) and parallel to a separating plane (17) between the reflector shells (10, 11), the indirect light beams (13a, 13b) are limited to the wall surfaces (6, 7) and adapted to their contour boundaries.

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